As smartphone proliferation exploded over the last year, the mobile payment space has also become a hot market. Mobile shopping in the US more than tripled from 2008 to 2009, according to ABI Research. With new offerings from groups like Square and Intuit joining credit card companies with new offerings, PayPal is working hard to maintain its edge in the digital payments space.

Mobile
transactions increased from
nearly $25 million in 2008 to $141 million in 2009 at PayPal. This year, the company is even more serious about mobile.

Bill Zielke, PayPal's senior director of North America merchant marketing, is responsible for the development and marketing of PayPal's product strategies. I spoke with Zielke about how PayPal works with businesses online and in mobile, as well as what new offerings PayPal has coming down the pipeline.